Question

SQL insert statement not producing error but not adding data

Asked by: realtytech

I have three controls on my page.  Two textboxes (txtusername and txtpassword) and a submit button (btnAdd)

When I click my button it runs the sub to add the user to the database.

 I am not getting any errors but my SQL table is not being updated.  The screen just posts back like nothing happened.  

Any ideas guys?

Attached is the code in my subroutine minus my connection info...

Thanks in advance!

    Dim con As New SqlConnection("; password=)
    Dim cmd As New SqlCommand("INSERT INTO userid (username, password, marketcenter) VALUES (" & txtUsername.text & ", " & txtPassword.text & ", " & strMarketCenter & ")", con)
    con.Open()
    cmd.executenonquery()
    con.close()
                                  
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Asked On
2009-11-03 at 19:43:27ID24869710
Tags

asp.net

,

mssql 2005

Topics

Programming for ASP.NET

,

MS SQL Server

Participating Experts
1
Points
250
Comments
6

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Answers

 

by: pettmansPosted on 2009-11-03 at 19:54:52ID: 25736261

You might need to include some single quotes if this is T-SQL syntax

Dim cmd As New SqlCommand("INSERT INTO userid (username, password, marketcenter) VALUES ('" & txtUsername.text & "',' " & txtPassword.text & "', '" & strMarketCenter & "')", con)

 

by: realtytechPosted on 2009-11-03 at 19:56:07ID: 25736267

hhmmmmmm....t-SQL?  I'm not familiar with that term.  This is an MSSQL server.

 

by: pettmansPosted on 2009-11-03 at 20:16:46ID: 25736363

Transact SQL is the flavour of sql used by sql server. If I were writing an insert query within SQL Server it would look like:

INSERT INTO userid (username, password, marketcenter)
VALUES ('value1', 'value2', 'value3')

assuming those fields are all string datatypes (char or varchar).

As the field values are surrounded by single quotes, sql server knows to interpret them as literals rather than column names.

If I were contructing a SQL statement to run then it would look a bit like this:

Declare @SQL_Statement varchar(500)
Declare @username varchar(50)
Declare @password varchar(50)
Declare @marketcenter varchar(50)

set @SQL_statement =
'INSERT INTO userid (username, password, marketcenter)
VALUES (''' +  @username +  ''','' '
              + @password + ''', '''
                  + @MarketCenter + ''')'

exec @sql_statement

In that code I have bunches of single quotes. If I set the following values for username, password, etc,

set @username = 'Tom'
Set @password = 'secret'
set @marketcenter = 'middle'

the the statement that would be executed is:

INSERT INTO userid (username, password, marketcenter)   VALUES ('Tom',' secret', 'middle')

So...
Extrapolating that back to your .Net code, I simply added single quotes at appropriate spots so that the command you end up running looks similar to the example above.

Hope that makes sense.

 

by: realtytechPosted on 2009-11-03 at 20:39:19ID: 25736442

Awesome thanks for that explanation.  However, I am still getting the same response.  No error but no add.  Let me pose this question to you if you don't mind.  My table actually has 5 columns.  On my INSERT statement I am inserting 3 as you can see.  The other two columns are the key (which I have told SQL server to generate automatically as an integer) and also an admin column which I told to set default as 0.  Do I need to include these columns into my INSERT statement somehow?  I assumed that since they are set to generate automatically and also to be set as a default that I would just have to insert the 3 columns I am trying here.  Does that make sense?

Upping points...

 

by: pettmansPosted on 2009-11-03 at 21:22:45ID: 25736635

You don't need to specify all column names as long as the other columns have:
either default or generated values (eg an identity column)
or allow null values.

I don't do a lot .Net programming but I can think of a couple of ways you can try to work out what is going on:

Generate the command are going to execute and display it. Then copy and paste to a SQL Server management studio window and execute it there to see what happens. Make sure you are using the same credentials as are used in your app.
Eg

dim the_command as string
the_command = "INSERT INTO userid (username, password, marketcenter) VALUES ('" & txtUsername.text & "',' " & txtPassword.text & "', '" & strMarketCenter & "')"

response.write the_command  (or run within debugger and set a watch on the_command)

Sorry if my syntax is out of date.

I understand that sqlcommand.executenonquery returns the number of rows affected. Can you test that value?


 

 

by: realtytechPosted on 2009-11-03 at 21:52:45ID: 31649822

found the answer...........i'd rather not talk about it :-)  thanks for all your help

20120131-EE-VQP-002

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